Lektro-Vend Combo Series, Service Manual

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THEORY OF OPERATION
When inserting coins and the highest price set in the machine is reached, no additional coins will be accepted
by the changer. When inserting bills and the highest vend price set in the machine is reached the validator
will not accept any additional bills and the changer will not accept any coins.
By pressing a selection letter and number the control board will compare the price of that selection with the
credit accumulated and if there is enough a vend motor or a solenoid will be energized. When the vend is
completed the control board will then determine if any change is due and dispense the correct change from
the changer.
Should a vend motor fail to return to the home position in 6) seconds the control board will assume that
the motor is jammed. The control board will automatically take the selection out of service (remove it from the
machine configuration and inform the customer to “Make an Alternate Selection”. A jammed motor does not
affect any other selection in the machine. The selection that is jammed will be displayed on the digital display
as out of service when the mode button is pressed. The vend motor can be put back into service when the
mode button is pressed and the selection has been service vended two (2) times.
the level of coins in the changer is too low the control board will display the message “USE CORRECT
CHANGE” on the display and will also shut down the bill acceptance feature (if validator is installed).
When going into the Service Mode the control board will display the following message if there is a problem.
A. selection letter and number of a faulty or jammed motor along with an error code. Error 1 or
Error 2
B. Error code 3 = Loss of communication with changer.
Charger has malfunctioned
C. Error code 4 = EEPROM Sum check error.
NOTE: Error4 Prices have been inadvertently altered and all prices have automatically been set to maximum
by the control board. To clear these prices, reset pricing as desired.
If a bill is being utilized the machine can be programmed to Forced Vend or a Non-Forced Vend
system. When the Forced Vend option is used the customer must make a vend when the bill is accepted.
Thus, the customer cannot use the machine as a change maker.
When removing the control board extreme care should be taken to avoid introducing static
electricity into or onto the board. Under no circumstances should the board be placed on anything made of
metal. To remove the control board simply disconnect power to the control board, remove the control board
cover, unplug the harness and remove the screws mounting the control board to the door.